If you've ever wondered whether there's a magical formula for how to suck out nearly every last ounce of fun from an otherwise pretty great game, Dungeon Hunter 4 is a shining example of the quickest way to get it done. Gameloft's latest slick entry in the venerable iOS dungeon crawling hack-and-slash series is absolutely rife with over-aggressive pitches for in-app purchases. Granted, some level of that is expected in free-to-play offerings of this caliber, but Dungeon Hunter 4's approach borders on the insidious. It's a shame, really, because the game itself is quite good – at least during the few brief moments when it's not prodding you incessantly to spend more and more cash.